White roofs have been proven to help cool buildings while also helping to reduce a city’s temperature. But what would happen with a white roof in a Chinese city, where elevated pollution levels might turn a white roof sooty after a few months? Lab scientists are working in collaboration with researchers at Oak Ridge Lab and Dow Chemical Company in a unique project to develop and commercialize a superhydrophobic additive that would make white roofs repel water and resist soiling, and thus stay cleaner and last longer. More>